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2024 3rd International Conference on New Energy, Energy Storage and power Engineering, NESP 2024

作者： Yin, Weihua Luo, Guocai Jian, Lingyun Liao, Tingjian Xiao, Qian Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China Hunan Spec. Equipment Electric Energy Conversion and Control Engineering Technology Research Center Shaoyang University Shaoyang422000 China State Grid Hunan Province Electric Power Company Shaoyang Power Supply Branch Shaoyang422000 China

This paper aims to enhance the precision and efficiency of the calculation model for the equivalent icing thickness of tangent towers. The current calculation model for equivalent icing thickness of transmission lines lacks consideration of the influence of representative spans and controlled meteorological conditions. It also overlooks the impact of the concentrated load of the tension insulator string on the suspension shape of the conductor, as well as the compensatory capability of the suspension insulator string to counteract stress on the overhead transmission lines when deflected, resulting in calculation deviations. To resolve these issues, this paper investigates the dynamic characteristics of transmission line parameters and proposes a calculation model for equivalent icing thickness based on the representative span. The improved model demonstrates enhanced efficiency and accuracy in measuring the equivalent icing thickness for on-line icing-monitoring of transmission lines. Experimental results confirm a reduction in relative error compared to reference values, with the relative error gradually decreasing as ice thickness increases, indicating enhanced accuracy. The efficacy of this model is substantiated through experiments, offering a more efficient and precise method for monitoring ice thickness in engineering applications. © Published under licence by IOP Publishing Ltd.

关键词： Ice

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Optimization of Sound Absorption and Insulation Performances of a Dual-Cavity Resonant Micro-Perforated Plate

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Fluid Dynamics & Materials Processing 2022年第2期18卷 481-496页

作者： Wei Chen Zhaofeng Guo Hongda Feng Sheng Hu Ling Lu Chuanmin Chen Xiaowen Wu Hao Cao State Grid Hunan Electric Power Co. Ltd.Electric Power Research InstituteChangsha410000China State Grid Corporation of China Power Facilities Noise and Vibration Laboratory Changsha410000China North China Electric Power University Department of Environmental Science and EngineeringHebei Provincial Key Laboratory of Coal-Fired Power Station Flue Gas Multi-Pollution Cooperative ControlBaoding071003China North China Electric Power University Key Laboratory of Regional Energy System Optimization Ministry of EducationBeijing102206China

This study investigates a dual-cavity resonant composite sound-absorbing structure based on a micro-perforated *** the COMSOL impedance tube model,the effects of various structural parameters on sound absorption and sound insulation performances are *** show that the aperture of the micro-perforated plate has the greatest influence on the sound absorption coefficient;the smaller the aperture,the greater is this *** thickness of the resonance plate has the most significant influence on the sound insulation and resonance frequency;the greater the thickness,the wider the frequency domain in which sound insulation is *** addition,the effect of filling the structural cavity with porous foam ceramics has been studied,and it has been found that the porosity and thickness of the porous material have a significant effect on the sound absorption coefficient and sound insulation,while the pore size exhibits a limited influence.

关键词： Micro perforated plate double cavity compound resonance structure sound absorption coefficient sound insulation

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Magnetic field simulation and no-load loss calculation of large three-phase five-column disassembled transformer

Magnetic field simulation and no-load loss calculation of la...

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2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

作者： Zhihua, Peng Yuqing, Sun Mingjian, Tan Jintian, Yin Li, Lin Guohua, Huang Jie, Tang Shaoyang University School of Electrical Engineering Hunan Shaoyang422000 China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Hunan Shaoyang422000 China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hunan Hengyang421001 China

ISBN: (纸本)9781665428101

Due to the limitation of transportation conditions, the volume of the transformer cannot be increased indefinitely. Therefore, it is necessary to disintegrate the iron core for transportation. Due to structural changes, the magnetic field distribution of the transformer core may be disordered and the no-load loss is too large. This paper, based on the field-circuit coupled finite element, conducted the three-dimensional transient electromagnetic field simulation study on the no-load performance of a large-scale three-phase five-column disassembled transformer. The magnetic density, no-load current and no-load loss of the transformer iron core were calculated. The simulation results were consistent with the experiment, verifying the correctness of the simulation method. © 2021 IEEE.

关键词： Magnetic fields

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Three-dimensional Leakage Magnetic Field Simulation and Short-circuit Impedance Calculation of Large Yoke Transformer

Three-dimensional Leakage Magnetic Field Simulation and Shor...

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2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

作者： Zhihua, Peng Hongfa, Zeng Mingjian, Tan Jintian, Yin Li, Lin Guohua, Huang Jie, Tang Shaoyang University School of Electrical Engineering Hunan Shaoyang422000 China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Hunan Shaoyang422000 China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hunan Hengyang421001 China

ISBN: (纸本)9781665428101

Limited by road and railway transportation conditions, the volume of large transformers cannot be increased indefinitely. For this reason, it is necessary to compress the height of the transformer core for transportation. However, the change of the core size will cause problems such as uneven distribution of the leakage magnetic field, excessive loss of the leakage magnetic field, and changes in the short-circuit impedance. Based on Magnet software, a three-dimensional transient field simulation analysis of the short-circuit performance of a 500kV single-phase three-column yoke transformer was carried out in this paper, and the leakage magnetic field and winding short-circuit impedance of the yoke transformer were obtained. The simulation results were compared with the experimental values provided by the manufacturer, showing small error, which verified the simulation method, and provided theoretical guidance for transformer design in the actual engineering. © 2021 IEEE.

关键词： Deflection yokes

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A Second Order Sliding Mode control Scheme of grid-Side Converter for Dfig System

SSRN

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SSRN 2023年

作者： Shi, Shuqi Liu, Zongze Ren, Long Lin, Li Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China School of Automation Central South University Changsha410083 China

In general, the wind speed is change with the environment and further has an impact on the power generation of the doubly-fed induction generator (DFIG) system. Besides, the capacitance of DC-link capacitor may change with the working condition. To address this issue, a second-order sliding-mode control (SOSMC) alternatives is put forward to ameliorate the DC-link voltage dynamic performance of the grid-side converter (GSC) for the DFIG system under the variable wind power generation and DC-link capacitance parameter disturbance. In this study, a SOSMC scheme is proposed to replace the conventional proportional integral (PI) control for the DC-link voltage controller of the GSC for the DFIG system. By using the nonlinear SOSMC controller, the DFIG system is robust to the disturbance of the wind speed and the parameter of DC-link capacitance. Compared with the traditional PI regulate scheme, the DFIG system with the proposed SOSMC scheme is much more robust, which has been verified in the MATLAB/Simulink platform. © 2023, The Authors. All rights reserved.

关键词： Sliding mode control

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Magnetic field simulation and no-load loss calculation of large three-phase five-column disassembled transformer

Magnetic field simulation and no-load loss calculation of la...

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International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Peng Zhihua Sun Yuqing Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

关键词： Solid modeling Simulation Transportation Transformer cores Transformers Iron Software

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Three-dimensional Leakage Magnetic Field Simulation and Short-circuit Impedance Calculation of Large Yoke Transformer

Three-dimensional Leakage Magnetic Field Simulation and Shor...

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International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Peng Zhihua Zeng Hongfa Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

关键词： Solid modeling Analytical models Windings Transportation Transformer cores Transformers Magnetic fields

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Optimal capacity allocation of pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation in river basins

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Dianli Xitong Baohu yu Kongzhi/power System Protection and control 2025年第11期53卷 1-13页

作者： Zhong, Hao Liu, Haoyu Shi, Yu Wang, Qiujie Zhang, Yonghao Wang, Xinghuo Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydro-power Station China Three Gorges University Yichang443002 China College of Electrical Engineering & New Energy China Three Gorges University Yichang443002 China State Grid Hunan Electric Power Company Changsha Power Supply Branch Changsha410035 China

In order to alleviate the shortage of flexible resources in power systems in remote areas and to reduce economic losses caused by the fluctuating and uncertain output of wind and solar power stations, this paper proposes an optimal capacity allocation method for pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation station in river basins. First, the method fully utilizes the idle capacity of agricultural irrigation stations during different seasons and integrates them with small hydropower plants to form a pumped storage aggregation unit. Then, the uncertainties of wind, solar and hydro power in different seasons are modelled using scenario sets. Based on Gale-Shapley bilateral matching mechanism, wind and solar power stations act as the selection party and aim to maximize economic returns in the optimization model. The pumped storage aggregation unit acts as the receiving party and a two-layer optimal allocation model is established. The upper layer focuses on maximizing annual profits to determine reservoir capacity allocation, while the lower layer targets maximizing aggregation benefits to optimize the aggregated system. Finally, the combination of particle swarm optimization algorithm and CPLEX solver is utilized to solve the model. Case studies show that the proposed method can fully leverage the flexible regulation capability of the pumped storage aggregation unit and effectively cope with the volatility and uncertainty of wind and solar output. © 2025 power System Protection and control Press. All rights reserved.

关键词： Hydro energy

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Mathematical Model of Four-Winding Inductive Filtering Converter Transformer and Its Application

Mathematical Model of Four-Winding Inductive Filtering Conve...

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2019 IEEE PES Innovative Smart grid Technologies Asia, ISGT 2019

作者： Sun, Jing Luo, Longfu Huang, Zhao College of Electrical and Information Engineering Hunan University Changsha China Hunan Provincial Key Laboratory of Grids Operation Control on Multi-Power Sources Area Shaoyang University Shaoyang Shaoyang China

ISBN: (纸本)9781728135205

In this paper, a new inductive filtering scheme with a four-winding inductive filtering converter transformer (FWIFCT) and its filtering system is proposed to solve the harmonic pollution problems generally existing in the high voltage direct current (HVDC) transmission system. The main circuit topology by series combining the fully tuned filters with the filtering winding of the FWIFCT are described. Based on the inductive filtering method, the voltage transfer mathematical model is established, and then the operation characteristics of the FWIFCT in HVDC system are analyzed in detail. The simulation model in the PSCAD/EMTDC simulator and prototype experiment of the FWIFCT and its filtering system for HVDC transmission system are built. The simulation and experiment results show that the filtering effect of the new inductive filtering scheme is better than that of the traditional filtering scheme, and it can effectively improve the power quality of ac grid-side, which verifies the effectiveness of the proposed theory. © 2019 IEEE.

关键词： HVDC power transmission

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multi-objective Distributed Wind Generation Planning in an Unbalanced Distribution System

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CSEE Journal of power and Energy Systems 2017年第2期3卷 186-195页

作者： Yu Zheng Zhao Yang Dong Ke Meng Hongming Yang Mingyong Lai Kit Po Wong Electric Power Research Institute China Southern Power GridGuangzhou 510080China School of Electrical and Information Engineering the University of SydneySydneyNSW 2006Australia Hunan Provincial Engineering Research Center of Electric Transportation and Smart Distributed Network Hunan Provincial Key Laboratory of Smart Grids Operation and ControlSchool of Electrical&Information EngineeringChangsha University of Science and TechnologyChangsha 410114China School of Electrical Electronic and Computer EngineeringThe University of Western AustraliaCrawleyWA 6009Australia

In addition to increasing penetration of distributed generation(DG),the distribution system power flow may be significantly impacted by direction and *** paper proposes a method for optimal placement of wind DG considering the unbalanced operation of distribution *** objective function includes static voltage stability index,three-phase unbalance index,system reliability index,and DG investment *** untransposed distribution lines and unbalanced load are modelled,and corresponding static voltage stability index and system reliability considering DG penetrations are *** expected and stochastic daily distributed generation and demand profiles in four seasons are calculated to improve the *** solve this multi-objective optimization model,a fuzzy membership function is used to integrate the four individual objectives,and a sensitivity-based method is proposed to solve the model *** study on IEEE 13-bus distribution 3-phase networks and 123-node test feeder successfully verifies the performance of the proposed approach.

关键词： Distribution generation(DG) mixed integer programming unbalanced distribution systems voltage stability

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